Manual Characterization of Perceived Transducer Distortion

1. A system, comprising: a signal generator configured to generate a test signal for a frequency band, the test signal including at least two simultaneous frequency-modulated tones, the at least two simultaneous frequency-modulated tones having different frequencies within the frequency band; a controller configured to receive user input indicating a gain value; a multi-band compressor coupled to the signal generator and configured to split the test signal into a plurality of frequency sub-bands, and to individually adjust an amplitude of a component of each of the plurality of frequency sub-bands based on the gain value; and an audio transducer coupled to the multi-band compressor and configured to generate an audio signal based on the test signal.

2. The system according to claim 1 , wherein the controller is further configured to determine a distortion threshold for the frequency band based on the gain value.

3. The system according to claim 1 , wherein the test signal includes an amplitude-modulated envelope including at least one of the at least two simultaneous frequency-modulated tones.

4. The system according to claim 3 , wherein the signal generator is further configured to generate the test signal including the amplitude-modulated envelope having a difference of at least one decibel between a modulation amplitude of the amplitude-modulated envelope and a carrier amplitude of the amplitude-modulated envelope.

5. The system according to claim 3 , wherein the signal generator is further configured to generate the test signal including the amplitude-modulated envelope having a difference of approximately six decibels between a modulation amplitude of the amplitude-modulated envelope and a carrier amplitude of the amplitude-modulated envelope.

6. The system according to claim 3 , wherein the signal generator is further configured to set a window length of the amplitude-modulated envelope based on a center frequency of the frequency band.

7. The system according to claim 1 , wherein the different frequencies of the at least two simultaneous frequency-modulated tones are all greater than a predetermined threshold.

8. A method, comprising: generating a test signal for a frequency band, the test signal including at least two simultaneous frequency-modulated tones, the at least two simultaneous frequency-modulated tones having different frequencies within the frequency band; receiving user input indicating a gain value; splitting the test signal into a plurality of frequency sub-bands; individually adjusting an amplitude of a component of each of the plurality of frequency sub-bands based on the gain value; and generating an audio signal with an audio transducer based on the test signal.

9. The method according to claim 8 , further comprising determining a distortion threshold for the frequency band based on the gain value.

10. The method according to claim 8 , wherein generating the test signal includes generating an amplitude-modulated envelope including at least one of the at least two simultaneous frequency-modulated tones.

11. The method according to claim 10 , wherein a difference between a modulation amplitude of the amplitude-modulated envelope and a carrier amplitude of the amplitude-modulated envelope is at least one decibel.

12. The method according to claim 10 , wherein a difference between a modulation amplitude of the amplitude-modulated envelope and a carrier amplitude of the amplitude-modulated envelope is approximately six decibels.

13. The method according to claim 10 , further comprising determining a window length for the amplitude-modulated envelope based on a center frequency of the frequency band.

14. The method according to claim 8 , wherein the different frequencies of the at least two simultaneous frequency-modulated tones are all greater than a predetermined threshold.

15. A non-transitory computer-readable medium storing instructions that, when executed by an electronic processor of a computer, cause the computer to perform operations comprising: generating a test signal for a frequency band, the test signal including at least two simultaneous frequency-modulated tones, the at least two simultaneous frequency-modulated tones having different frequencies within the frequency band; receiving a user input indicating a gain value; splitting the test signal into a plurality of frequency sub-bands; individually adjusting an amplitude of a component of each of the plurality of frequency sub-bands based on the gain value; and generating an audio signal with an audio transducer based on the test signal.

16. The non-transitory computer-readable medium according to claim 15 , further comprising determining a distortion threshold for the frequency band based on the gain value.

17. The non-transitory computer-readable medium according to claim 15 , wherein generating the test signal includes generating an amplitude-modulated envelope including at least one of the at least two simultaneous frequency-modulated tones.

18. The non-transitory computer-readable medium according to claim 17 , wherein a difference between a modulation amplitude of the amplitude-modulated envelope and a carrier amplitude of the amplitude-modulated envelope is at least one decibel.

19. The non-transitory computer-readable medium according to claim 17 , wherein a difference between a modulation amplitude of the amplitude-modulated envelope and a carrier amplitude of the amplitude-modulated envelope is approximately six decibels.

20. The non-transitory computer-readable medium according to claim 17 , further comprising determining a window length for the amplitude-modulated envelope based on a center frequency of the frequency band.